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An angular measure is necessary, of course, that of the angle which the disk of the moon fills as seen from the earth.

Thus all the ordinary propositions of geometry in which distance and angular measure do not enter otherwise than in cross ratios can now be enunciated and proved.

Does the 310� refer to angular measure and if so, is the plane of distortion horizontal or vertical?

Our mode of computing time, and our angular measure, are the only relics of this obsolete system.

As, for instance, N by E, E by N, E by S, S by E, S by W, W by S, W by N, N by W. Also NE x N, NE x E, SE x E, SE x S, SW x S, SW x W, NW x W, NW x N. The angular distance between each and every whole point is divided into 4 parts called half and quarter points and each representing an angular measure of approximately 2� 49'.